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Title: Dual Potential Capacity Model for Deep RC Members Strengthened by Fiber-Reinforced Polymer Composites

Author(s): Deuckhang Lee

Publication: Structural Journal

Volume:

Issue:

Appears on pages(s):

Keywords: aggregate interlock; composites; compression zone; deep beam; dual potential capacity model (DPCM); fiber-reinforced polymer (FRP); shear

DOI: 10.14359/51740853

Date: 6/3/2024

Abstract:
There has been an ongoing academic challenge for the past several decades to understand the shear transfer mechanism in reinforced concrete (RC) members, particularly in those with small shear span-depth ratios, also known as deep beams. Analytical uncertainty regarding shear strength inevitably gets higher when those deep members are strengthened in shear by using externally bonded fiber-reinforced polymer (FRP) composites. This study aims to investigate the complex inter-related effects of short shear span-depth ratio and FRP composites to RC deep beam members. To this end, the fundamental formulations of the dual potential capacity model (DPCM) are extended to RC deep members reinforced with externally bonded FRP composites. The proposed model can consider the various types of FRP composites, fiber bonding configurations, and fiber layout, and various failure modes of concrete and FRP reinforcements are also reflected. A total of 131 shear test results of RC deep and short members with externally bonded FRP composites are carefully collected, and those are added to the existing database of RC slender members strengthened with FRP composites. On this basis, the proposed approach is verified by comparing test results with analysis results, and a reasonable level of analytical accuracy is achieved. The statistical data distribution of strength ratios between test and analytical results is consistent across a range of shear span-depth ratios from about 0.7 to 4.0. Overall, the proposed DPCM approach provides a useful tool for analyzing the shear strength of RC deep beam members strengthened with externally bonded FRP composites.


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Electronic Structural Journal

Electronic Structural Journal